Update of the BIPM comparison BIPM.RI(II)-K1.Cu-64 of activity measurements of the radionuclide⁶⁴Cu to include the 2009 results of the CMI–IIR (Czech Rep.) and the NPL (UK), the 2010 result of the LNE–LNHB (France) and the 2011 result of the ENEA–INMRI (Italy)

Abstract

Since 2009, four national metrology institutes (NMI) have submitted four samples of known activity of 64Cu to the International Reference System (SIR) for activity comparison at the Bureau International des Poids et Mesures (BIPM), with comparison identifier BIPM.RI(II)-K1.Cu-64. The values of the activity submitted were between about 3 MBq and 260 MBq. There are now five results in the BIPM.RI(II)-K1.Cu-64 comparison. A key comparison reference value (KCRV) has been calculated for the first time for this nuclide. The degrees of equivalence between each equivalent activity measured in the SIR and the KCRV have been calculated and the results are given in the form of a table. A graphical presentation is also given.Main text. To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database kcdb.bipm.org/.The final report has been peer-reviewed and approved for publication by the CCRI, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).

64Cu production by 14 MeV neutron beam

“…The activity measurements of the irradiated material (when possible also in liquid solution obtained by proper radiochemical treatments as described in the previous section) were carried out at the Radioactivity Laboratory of the ENEA-INMRI. The measurements were performed in high-metrological conditions by assuring their traceability to the 64 Cu primary standard developed [16] and maintained [22] at ENEA-INMRI and transferred, by calibration procedures, to the end-users [15]. In particular, three absolute metrological techniques were applied to carry out these measurements.…”

News from the BIPM laboratories—2013

“…The analysis is ongoing. Updated reports of three comparisons were published in the Metrologia Technical Supplement covering 64 Cu [4], 134 Cs [5] and 137 Cs [6] including the linked COOMET.RI(II)-K2.Cs-137 comparison.…”